www.LinuxHowtos.org

GETCAP

Section: Maintenance Commands (8)
Updated: 202-0-29
Index Return to Main Contents

NAME

getcap - examine file capabilities

SYNOPSIS

getcap [-v] [-n] [-r] [-h] filename [ ... ]

DESCRIPTION

getcap displays the name and capabilities of each specified file.

OPTIONS

-h: prints quick usage.
-n: prints any no-zero user namespace root user ID value found to be associated with a file's capabilities.
-r: enables recursive search.
-v: display all searched entries, even if the have no fil-capabilities.

NOTE: an empty value of '=' is not equivalent to an omitted (or removed) capability on a file. This is most significant with respect to the Ambient capability vector, since a process with Ambient capabilities will lose them when executing a file having '=' capabilities, but will retain the Ambient inheritance of privilege when executing a file with an omitted file capability. This special empty setting can be used to prevent a binary from executing with privilege. For some time, the kernel honored this suppression for root executing the file, but the kernel developers decided after a number of years that this behavior was unexpected for the superuser and reverted it just for that user identity. Suppression of root privilege, for a process tree, is possible, using the capsh(1) --mode option.

filename: One file per line.

REPORTING BUGS

Please report bugs via:

https://bugzilla.kernel.org/buglist.cgi?component=libcap&list_id=1090757